Answer
How is a hotel tech stack interconnected?
The hotel tech stack is a hub-and-spoke architecture with the Property Management System at the centre. Five primary integrations radiate outward: channel manager (for OTA distribution), booking engine (for direct conversion), payment processor (for transactions), guest-journey platform (for messaging, check-in, AI concierge, upsell), and accounting (for financial close). Each integration writes back to the PMS folio.
The hub: PMS
The PMS holds the canonical reservation, the rate calendar, the guest profile, and the folio. Every other tool either reads from or writes to the PMS. The quality of the PMS API is the single largest constraint on what the rest of the stack can do. Modern API-first PMSes (Mews, Apaleo) expose deep webhook-driven integrations; bundled all-in-ones (Cloudbeds, RoomRaccoon) trade some API depth for in-platform marketplace breadth.
The five core spokes
Channel manager pushes rates and inventory to OTAs and pulls reservations back into the PMS. Booking engine displays the direct rate, processes payment, and writes the booking to the PMS. Payment processor handles authorisation, capture, settlement, and refund. Guest-journey platform reads reservations from the PMS, sends pre-arrival and in-stay messages, runs check-in flows, posts upsell purchases back to the folio. Accounting pulls daily revenue and tax postings into the GL.
Why the architecture matters
Operators that treat the stack as five independent products end up with five tools that each work in isolation but together create reconciliation overhead. The integration between each pair is what determines whether the stack runs hands-free or requires daily babysitting. The integration shape, not the product features, is the question to ask during demos.